Atoms and Radioactivity

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Across
  1. 2. _______particle tracks that are straight
  2. 3. center of the atom
  3. 5. tracks are faint and change direction suddenly
  4. 8. Marie Curie won a nobel Prize in this field in 1903
  5. 10. Lady recognized for her discovery of radium
  6. 12. elements that have the same proton number but different neutron number
  7. 13. Na on the periodic table
  8. 14. proton number + neutron number
Down
  1. 1. device used to detect ionizing radiation
  2. 4. number of protons in gold
  3. 6. negatively charged particles orbiting the nucleus
  4. 7. element named after curie's homeland
  5. 9. mass number for Carbon
  6. 11. Cl on the periodic table